This is more than likely a pre plastic plug version and its a swine, working off memory here so may miss something out but :
Remove facia
Will see 2 screws, 1 either side under the hotplate, remove them.
Undo the screws either side of the hotplate that screw the side trims on.
Next bit you can do the long way if you wish which is remove the lid and such till you get to a point that the hotplate will lift up and remove
or
the way I used to do it was lift the hotplate side trims to around a 45 degree angle, then put my finger in a burner and pull the hotplate upwards till it clears the flue trim…. job done and in about a quater of the time of doing it the other way.